As much as I prefer EFI over carbs, ring ridge wasn't caused by carburetors, but rather by poor metallurgy. My '60s/'70s era high-nickel big block Cadillacs were never EFI'd, and at 300,000 miles they didn't have any bore taper. Sometime in the '80s GM significantly improved the metal they used in the small blocks.NOTE: For all the trouble that EFI systems can give us in troubleshooting mode, one of *the* main benefits that they give us engine guys is that since they are much more precise with cold fueling (vs carbs with the mechanical choke plates) ...you can open up a high mileage EFI SBC and there's near-zero ridge at the top of the cylinder bores? And I've personally seen decent cross-hatch still showing in the bores? It's amazing, especially when compared to what an old carb guy is used to seeing when the heads come off a carbureted junkyard jewel. :0)